Chapter 3- Assessment

1. What is the bit length of a SHA-256 output hash, and how is it usually expressed?

a) 160bits, base10

b) 256bits, base16

c) 512bits, base2

d) 256bits, base8

2. What hash function(s) is used to generate a transaction identifier (TXID) & Block ID?

a) SHA-512

b) RIPEMD-160

c) HASH-160

d) HASH-256

3. Use the hash calculator to find the message digests for the given input strings using the specified hash functions:

Input Message	Hash Function	Message Digest
1hash functions map an arbitrary length input to a fixed length output	SHA-256	43413cd5705ae60f89856a54dede636d8f3a7e781461afc86ac3fe5d86b6f604
1hash functions map an arbitrary length input to a fixed length output	SHA-256(SHA-256)	6f108ad8346c21d32841937e5e6b0074f223c75b9695c02d9d6428071066d5b9
1hash functions map an arbitrary length input to a fixed length output	HASH-256	6f108ad8346c21d32841937e5e6b0074f223c75b9695c02d9d6428071066d5b9

4. Use the hash calculator to calculate the TXID for the following transaction

Serialised TX in HEX	TXID in Little Endian	TXID in Big Endian
010000000167e7105b52e8534596af29dba949921cffe3dbaa555b8ed96121346c6755adae000000006a47304402206e4db9dee8449b861e5fdc00ba3bdb80fba8cd52c75489376c54bd65d26262650220453569438e6bc6f957b1f7ff6fff4af2e42edaae1ac885382373d42fa569b17c41210267d2d1f8b3affffa10b68b2756ba7f6f4efafcadbecd145181016178d00b379bffffffff019c276bee000000001976a914accd105073775756cc04962bc1e4893694f50c5588ac00000000	33e189f51be6bf7434f893f3a53513f664f25b00d15d96810bd27d3bbe307c35	357c30be3b7dd20b81965dd1005bf264f61335a5f393f83474bfe61bf589e133

5. Divide the following transaction up into its constituent elements:

01000000011e4bf9dc623d942fee4113e077f67204419cb6f841d98ebf250b698cbea8912b000000006b483045022100a7ce3b1d8cc852e625e5da3159131ba7ba071c7a93684f1d3b8d08b6dbc08e82022041ac850772b5877cc8b724f6a7a92709a65a17a52f78419b67304f2481526b79412102e8a1ab43a501a2ab84a14c5ef1a65c15add65f3ec8230e3fb63644a44ac71003ffffffff0200943577000000001976a914aa5604bae61cd60690dd9dec5efbb841668cb19288ac8f933577000000001976a914e33649e455368d536f6003b2908b6299df5fe8bf88ac00000000

Version	Input Count	Input List	Output Count	Output List	nLocktime
01000000	01	1e4bf9dc623d942fee4113e077f67204419cb6f841d98ebf250b698cbea8912b000000006b483045022100a7ce3b1d8cc852e625e5da3159131ba7ba071c7a93684f1d3b8d08b6dbc08e82022041ac850772b5877cc8b724f6a7a92709a65a17a52f78419b67304f2481526b79412102e8a1ab43a501a2ab84a14c5ef1a65c15add65f3ec8230e3fb63644a44ac71003ffffffff	02	00943577000000001976a914aa5604bae61cd60690dd9dec5efbb841668cb19288ac8f933577000000001976a914e33649e455368d536f6003b2908b6299df5fe8bf88ac	00000000

6. Using the transaction from the previous question, divide the input UTXO into its constituent elements:

01000000011e4bf9dc623d942fee4113e077f67204419cb6f841d98ebf250b698cbea8912b000000006b483045022100a7ce3b1d8cc852e625e5da3159131ba7ba071c7a93684f1d3b8d08b6dbc08e82022041ac850772b5877cc8b724f6a7a92709a65a17a52f78419b67304f2481526b79412102e8a1ab43a501a2ab84a14c5ef1a65c15add65f3ec8230e3fb63644a44ac71003ffffffff0200943577000000001976a914aa5604bae61cd60690dd9dec5efbb841668cb19288ac8f933577000000001976a914e33649e455368d536f6003b2908b6299df5fe8bf88ac00000000

Previous TX Hash	Previous Output Index	Input Script Length	Input Script	Sequence Number (nSequence)
1e4bf9dc623d942fee4113e077f67204419cb6f841d98ebf250b698cbea8912b	00000000	6b	483045022100a7ce3b1d8cc852e625e5da3159131ba7ba071c7a93684f1d3b8d08b6dbc08e82022041ac850772b5877cc8b724f6a7a92709a65a17a52f78419b67304f2481526b79412102e8a1ab43a501a2ab84a14c5ef1a65c15add65f3ec8230e3fb63644a44ac71003	ffffffff

7. Using the transaction from the previous question, divide the output UTXO(s) into its constituent elements:

01000000011e4bf9dc623d942fee4113e077f67204419cb6f841d98ebf250b698cbea8912b000000006b483045022100a7ce3b1d8cc852e625e5da3159131ba7ba071c7a93684f1d3b8d08b6dbc08e82022041ac850772b5877cc8b724f6a7a92709a65a17a52f78419b67304f2481526b79412102e8a1ab43a501a2ab84a14c5ef1a65c15add65f3ec8230e3fb63644a44ac71003ffffffff0200943577000000001976a914aa5604bae61cd60690dd9dec5efbb841668cb19288ac8f933577000000001976a914e33649e455368d536f6003b2908b6299df5fe8bf88ac00000000

01000000011e4bf9dc623d942fee4113e077f67204419cb6f841d98ebf250b698cbea8912b000000006b483045022100a7ce3b1d8cc852e625e5da3159131ba7ba071c7a93684f1d3b8d08b6dbc08e82022041ac850772b5877cc8b724f6a7a92709a65a17a52f78419b67304f2481526b79412102e8a1ab43a501a2ab84a14c5ef1a65c15add65f3ec8230e3fb63644a44ac71003ffffffff0200943577000000001976a914aa5604bae61cd60690dd9dec5efbb841668cb19288ac8f933577000000001976a914e33649e455368d536f6003b2908b6299df5fe8bf88ac00000000

Output Count	Value	Output Script Length	Output Script	Locktime
02	00943577	0000000019	76a914aa5604bae61cd60690dd9dec5efbb841668cb19288ac
	8f933577	0000000019	76a914e33649e455368d536f6003b2908b6299df5fe8bf88ac	00000000

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